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To allow a car to shut off a number of cylinders, you need to know how much power the car needs when cruising.
If for example, it was a light car and only needed the power of 2 (Out of its 4) cylinders when cruising, then deactivating the other 2 would work.
However, if you deactivate too many cylinders, the car will not have enough power to cruise - like throwing your car in 5th at 20mph, it might keep going, but it wont like it.
About the vibration issue... VW, Porsche and Subaru have your answer. Flat 4/6 cylinder engines, by design they are almost perfectly balanced. Deactivating 2 out of 4 cylinders would not cause any extra vibrations.
Last edited by vinny1989; 02-21-2009 at 05:32 PM..
Reason: Cant spell
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